I'd rather take Casillas a round, or two, later. Both are light in the pants and not big hitters. Both are fast, but Casillas is much better in coverage and is also projected to SS (would be the better nickel LB at least).
McRath is better against the run/rushing passer, but he would need to bulk up considerably to play inside in a 3-4. Burnett got up to 242 and still looked lean. McRath is a stick in comparison.
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Rob Ryan, Dallas Cowboys DC